--- funcs/func_devstate.c	1970-01-01 01:00:00.000000000 +0100
+++ funcs/func_devstate.c	2010-04-15 22:42:27.000000000 +0200
@@ -0,0 +1,228 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2007, Digium, Inc.
+ *
+ * Russell Bryant <russell@digium.com> 
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief Manually controlled blinky lights
+ *
+ * \author Russell Bryant <russell@digium.com> 
+ *
+ * \ingroup functions
+ *
+ * \note Props go out to Ahrimanes in #asterisk for requesting this at 4:30 AM
+ *       when I couldn't sleep.  :)
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision: 4 $")
+
+#include <stdlib.h>
+
+#include "asterisk/module.h"
+#include "asterisk/channel.h"
+#include "asterisk/pbx.h"
+#include "asterisk/utils.h"
+#include "asterisk/linkedlists.h"
+#include "asterisk/devicestate.h"
+#include "asterisk/cli.h"
+#include "asterisk/astdb.h"
+
+static const char astdb_family[] = "CustomDevstate";
+
+static const char *ast_devstate_str(int state)
+{
+	const char *res = "UNKNOWN";
+
+	switch (state) {
+	case AST_DEVICE_UNKNOWN:
+		break;
+	case AST_DEVICE_NOT_INUSE:
+		res = "NOT_INUSE";
+		break;
+	case AST_DEVICE_INUSE:
+		res = "INUSE";
+		break;
+	case AST_DEVICE_BUSY:
+		res = "BUSY";
+		break;
+	case AST_DEVICE_INVALID:
+		res = "INVALID";
+		break;
+	case AST_DEVICE_UNAVAILABLE:
+		res = "UNAVAILABLE";
+		break;
+	case AST_DEVICE_RINGING:
+		res = "RINGING";
+		break;
+	case AST_DEVICE_RINGINUSE:
+		res = "RINGINUSE";
+		break;
+	case AST_DEVICE_ONHOLD:
+		res = "ONHOLD";
+		break;
+	}
+
+	return res;
+}
+
+static int ast_devstate_val(const char *val)
+{
+	if (!strcasecmp(val, "NOT_INUSE"))
+		return AST_DEVICE_NOT_INUSE;
+	else if (!strcasecmp(val, "INUSE"))
+		return AST_DEVICE_INUSE;
+	else if (!strcasecmp(val, "BUSY"))
+		return AST_DEVICE_BUSY;
+	else if (!strcasecmp(val, "INVALID"))
+		return AST_DEVICE_INVALID;
+	else if (!strcasecmp(val, "UNAVAILABLE"))
+		return AST_DEVICE_UNAVAILABLE;
+	else if (!strcasecmp(val, "RINGING"))
+		return AST_DEVICE_RINGING;
+	else if (!strcasecmp(val, "RINGINUSE"))
+		return AST_DEVICE_RINGINUSE;
+	else if (!strcasecmp(val, "ONHOLD"))
+		return AST_DEVICE_ONHOLD;
+
+	return AST_DEVICE_UNKNOWN;
+}
+
+static int devstate_read(struct ast_channel *chan, char *cmd, char *data, 
+	char *buf, size_t len)
+{
+	ast_copy_string(buf, ast_devstate_str(ast_device_state(data)), len);
+
+	return 0;
+}
+
+static int devstate_write(struct ast_channel *chan, char *function,
+	char *data, const char *value)
+{
+	size_t len = strlen("Custom:");
+
+	if (strncasecmp(data, "Custom:", len)) {
+		ast_log(LOG_WARNING, "The DEVSTATE function can only be used to set 'Custom:' device state!\n");
+		return -1;
+	}
+	data += len;
+	if (ast_strlen_zero(data)) {
+		ast_log(LOG_WARNING, "DEVSTATE function called with no custom device name!\n");
+		return -1;
+	}
+
+	ast_db_put(astdb_family, data, (char *) value);
+
+	ast_device_state_changed("Custom:%s", data);
+
+	return 0;
+}
+
+static int custom_devstate_callback(const char *data)
+{
+	char buf[256] = "";
+
+	ast_db_get(astdb_family, data, buf, sizeof(buf));
+
+	return ast_devstate_val(buf);
+}
+
+static int cli_funcdevstate_list(int fd, int argc, char *argv[])
+{
+	struct ast_db_entry *db_entry, *db_tree;
+
+	if (argc != 2)
+		return RESULT_SHOWUSAGE;
+
+	ast_cli(fd, "\n"
+	        "---------------------------------------------------------------------\n"
+	        "--- Custom Device States --------------------------------------------\n"
+	        "---------------------------------------------------------------------\n"
+	        "---\n");
+
+	db_entry = db_tree = ast_db_gettree(astdb_family, NULL);
+	for (; db_entry; db_entry = db_entry->next) {
+		const char *dev_name = strrchr(db_entry->key, '/') + 1;
+		if (dev_name <= (const char *) 1)
+			continue;
+		ast_cli(fd, "--- name: 'custom:%s'  state: '%s'\n"
+		               "---\n", dev_name, db_entry->data);
+	}
+	ast_db_freetree(db_tree);
+	db_tree = NULL;
+
+	ast_cli(fd,
+	        "---------------------------------------------------------------------\n"
+	        "---------------------------------------------------------------------\n"
+	        "\n");
+
+	return RESULT_SUCCESS;
+}
+
+static struct ast_cli_entry cli_funcdevstate[] = {
+	{ { "funcdevstate", "list", }, cli_funcdevstate_list, NULL, NULL },
+};
+
+static struct ast_custom_function devstate_function = {
+	.name = "DEVSTATE",
+	.synopsis = "Get or Set a device state",
+	.syntax = "DEVSTATE(device)",
+	.desc =
+	"  The DEVSTATE function can be used to retrieve the device state from any\n"
+	"device state provider.  For example:\n"
+	"   NoOp(SIP/mypeer has state ${DEVSTATE(SIP/mypeer)})\n"
+	"   NoOp(Conference number 1234 has state ${DEVSTATE(MeetMe:1234)})\n"
+	"\n"
+	"  The DEVSTATE function can also be used to set custom device state from\n"
+	"the dialplan.  The \"Custom:\" prefix must be used.  For example:\n"
+	"  Set(DEVSTATE(Custom:lamp1)=BUSY)\n"
+	"  Set(DEVSTATE(Custom:lamp2)=NOT_INUSE)\n"
+	"You can subscribe to the status of a custom device state using a hint in\n"
+	"the dialplan:\n"
+	"  exten => 1234,hint,Custom:lamp1\n"
+	"\n"
+	"  The possible values for both uses of this function are:\n"
+	"UNKNOWN | NOT_INUSE | INUSE | BUSY | INVALID | UNAVAILABLE | RINGING\n"
+	"RINGINUSE | ONHOLD\n",
+	.read = devstate_read,
+	.write = devstate_write,
+};
+
+static int unload_module(void)
+{
+	int res = 0;
+
+	res |= ast_custom_function_unregister(&devstate_function);
+	ast_devstate_prov_del("Custom");
+	ast_cli_unregister_multiple(cli_funcdevstate, ARRAY_LEN(cli_funcdevstate));
+
+	return res;
+}
+
+static int load_module(void)
+{
+	int res = 0;
+
+	res |= ast_custom_function_register(&devstate_function);
+	res |= ast_devstate_prov_add("Custom", custom_devstate_callback);
+	ast_cli_register_multiple(cli_funcdevstate, ARRAY_LEN(cli_funcdevstate));
+
+	return res;
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Gets or sets a device state in the dialplan");
